EP0201513B1 - Offshore truss work type tower structure - Google Patents

Offshore truss work type tower structure Download PDF

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Publication number
EP0201513B1
EP0201513B1 EP85904679A EP85904679A EP0201513B1 EP 0201513 B1 EP0201513 B1 EP 0201513B1 EP 85904679 A EP85904679 A EP 85904679A EP 85904679 A EP85904679 A EP 85904679A EP 0201513 B1 EP0201513 B1 EP 0201513B1
Authority
EP
European Patent Office
Prior art keywords
leg
legs
trusses
tower structure
panels
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP85904679A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0201513A1 (en
Inventor
Per Arne Simensen
Gunnar Hakon Eide
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Saga Petroleum AS
Original Assignee
Saga Petroleum AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Saga Petroleum AS filed Critical Saga Petroleum AS
Publication of EP0201513A1 publication Critical patent/EP0201513A1/en
Application granted granted Critical
Publication of EP0201513B1 publication Critical patent/EP0201513B1/en
Expired legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B17/02—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B17/02—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto
    • E02B17/027—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto steel structures

Definitions

  • This invention relates to a method for constructing an offshore truss work type tower structure comprising outer legs and leg connecting trusses.
  • a non-conical offshore truss work type tower structure Has been described in US 3,094,847; the structure described therein comprises outer and inner legs, all substantially parallel, and provided with trusses which connect the outer legs and the outer with inner legs.
  • Such a structure still poses problems in its construction, not least from the number of trusses required to achieve stability, these being both cross and diagonal trusses between outer legs.
  • an offshore truss work type tower structure comprising a plurality of outer legs and at least one inner leg, all the legs being parallel, a plurality of trusses connecting adjacent outer legs to each other and to the inner leg at nodal points, characterised in that each leg is arranged equidistant from all adjacent legs and the nodal points on each outer leg are positioned intermediate of the nodal points on adjacent outer legs, such that all trusses from and between outer legs are arranged diagonally.
  • the tower structure may have a hexagonal cross section with one inner leg.
  • the tower structure of the present invention avoids several problems related to construction, such as connecting tower sections and launching; the tower cross section is substantially the same along the tower height, the tower being prismatic.
  • a tower structure could be of prismatic shape with trusses or brazings arranged in the outer panels, thereby providing a hollow type tower. This, however, would result in a large number of crossing trusses in the panels, which would mean a large number of nodal points.
  • the prismatic shape of the tower brings the advantage of a large number of uniform nodal points and a minimum amount of nodal point types.
  • the first illustrated embodiment of the tower of this method of construction is a prismatic tower structure having a hexagonal cross section with one centre leg, in which structure a nodal point in an outer leg will have six truss connections, two trusses to each of adjacent legs and two trusses to the centre leg, all trusses thereby being arranged diagonally. At each nodal point level on the centre leg, there is also six truss connections.
  • Such a hexagonal tower structure therefore has two types of nodal point.
  • an offshore truss work type tower structure as defined above which comprises legs and trusses, the legs being substantially parallel to one another and connected by the trusses, which are welded to the legs thereby making panels, the method being characterised by the constructing of the panels of the tower structure on site in such a way that no displacement of the panels must be performed, the method having only turning of the panels substantially around one leg resting on the ground level, thereby enabling welding of the trusses to the legs at the lowest possible levels.
  • the method is characterised by constructing at ground level a first panel comprising a second outer leg and a centre leg as well as connecting trusses; turning the first panel round the centre leg and connecting the second leg with a first leg and the first leg with the centre leg; simultaneously constructing a second panel comprising a third and a fourth leg; turning the second panel around the fourth leg and connecting second and third legs as well as third and fourth legs to the centre leg; turning the substructure consisting of first, second, third, fourth and centre legs around the first leg and connecting the substructure with a third panel consisting of a fifth and a sixth leg, thereby completing a tower structure section having a hexagonal cross section.
  • the tower structure may have a cross section comprising two partly overlapping hexagons, the inner leg of one hexagon thereby being an outer leg of the other hexagon and vice versa, and the trusses between the two inner legs being arranged perpendicularly to all legs.
  • the method may also be used to construct a double hexagonal tower structure type, the method being characterised by constructing two double panels at ground level, consisting respectively of a first and a fourth outer leg and a first inner leg and a sixth and an eleventh outer leg and a second inner leg; turning the double panels around the first outer leg and the sixth outer leg respectively; constructing outer panels comprising respectively a second and a third and a twelfth and a thirteenth outer leg which panels are turned around the second leg and thirteenth leg respectively; connecting each of the outer panels with its respective double panel to form a substructure; turning one of the substructures around the first leg and connecting the two substructures to each other by trusses, the trusses between the inner legs being arranged perpendicularly to the legs, a double hexagon tower structure hereby being completed having two hexagons partly overlapping.
  • the outer legs In a tower structure having two partly overlapping hexagons, in this connection defined as double hexagon, six of the outer legs also will have six truss connections at every nodal point level, whereas the two outer midlegs will have eight truss connections.
  • the double hexagon type tower structure there are provided two inner legs being connected with horizontal trusses. The inner legs will have two difference nodal points, one having seven truss connections and one having five truss connections, where one truss is arranged horizontally and the rest are arranged diagonally.
  • the double hexagon type will principally have therefore four different types of nodal point.
  • the double hexagon tower structure type provides an increased strength across the width by the addition of three outer legs, both in a direction perpendicular to the connection between the inner legs and substantially in this direction.
  • the tower structure may have a cross section comprising three hexagons, the inner leg of one hexagon being an outer leg of the two other hexagons and vice versa and the trusses between the three inner legs being arranged perpendicularly to the legs.
  • the method may also be used to construct a triple hexagon structure type, the method being characterised by the double hexagon tower structure being turned around the first leg to an upright position and a further panel consisting of a fourteenth and a fifteenth leg being connected to the double hexagon tower structure, the trusses connecting the inner legs all being arranged perpendicularly to the legs.
  • a triple hexagon tower structure can be achieved which increases the tower strength remarkably in all directions.
  • the principal of forged nodal points advantageously can be used. Principally the truss length in the outer panels is the same, also in the radial and centre panels, and each weld is made substantially as a butt weld which advantageously simplifies the welding as well as the examination of welds.
  • Fig. 1 discloses schematically a perspective part of a single hexagon tower structure
  • Fig. 2 discloses a double hexagon tower structure
  • Fig. 3 discloses a triple hexagon tower structure
  • Figs. 4, 5 and 6 disclose the construction steps for a single, double and triple hexagon tower structure respectively according to the present invention.
  • Figs. 1, 2 and 3 for clarity only disclose the truss work part in front of the centre leg.
  • Fig. 1 The principal of the offshore truss work type tower structure in its simplest embodiment is disclosed in Fig. 1 by a single hexagon tower structure.
  • the tower structure of Fig. 1 comprises legs (shown generally as 30) and connecting trusses (shown generally at 31), the legs 30 being outer legs 1-6 and a centre leg 7.
  • a nodal point 19 on leg 6 and a nodal point 22 on leg 2 as well as a corresponding nodal point on leg 4 are arranged at the same level.
  • From the nodal point 19 trusses 8 extend upwards to nodal point 17 on leg 5 and nodal point 21 on leg 1 and downwards to nodal point 16 on leg 5 and nodal point 23 on leg 1.
  • Nodal points 16 and 23 as well as a third nodal point (not shown) on leg 3 are arranged at the same level and between two levels of nodal points on leg 6.
  • trusses 9 extend from the nodal point 19 upwards to a nodal point 24 and downwards to a nodal point 25 on the centre leg 7.
  • Nodal point 24 on the centre leg 7 is arranged at the same level as the nodal points 17 and 21 on legs 5 and 1 respectively.
  • Fig. 4 discloses one method for constructing a single hexagonal tower structure where a radial panel between leg 2 and the centre leg 7 is first constructed at the ground level and thereafter turned around centre leg 7 to a position where legs 7 and 2 are connected with leg 1 thereby providing a triangular-shaped structure. Simultaneously an outer panel is constructed consisting of legs 3 and 4 with connecting trusses, which panel thereafter is turned around leg 4 in such a way that trusses 31 may be connected between outer legs 3 and 2 between the outer legs 3,4 and the centre leg 7.
  • a double hexagonal tower structure may be constructed according to Fig. 5 by welding together outer legs 1 and 4 as well as internal leg 7 on the ground level and simultaneously a panel comprising outer legs 6 and 11 and internal leg 5. Thereafter the panels are turned around legs 1 and 6 respectively, the outer panel comprising legs 2 and 3 and 12 and 13 respectively are constructed on ground level and turned around legs 2 and 13 respectively whereafter trusses between outer legs 3 and 4 and 2 and 1 as well as 11 and 12 and 6 and 13 may be inserted as well as the internal trusses between the centre leg 7 and the outer legs 2 and 3, and centre leg 5 and outer legs 12 and 13 respectively. Thereafter the substructure consisting of outer legs 1-4 and internal leg 7 is turned around leg 1 and trusses may be secured between legs 4 and 11,1 and 6, 4 and 5 and 7 and 6, as well as the horizontal trusses 10 between the internal legs 7 and 5.
  • a triple hexagonal tower structure the structure disclosed in Fig. 5 can be turned around leg 1 to the position disclosed in Fig. 6.
  • An outer panel consisting of legs 14 and 15 is constructed at ground level and thereafter turned around leg 15, whereafter trusses may be secured between legs 13 and 14 and 6 and 15.
  • the internal legs 7, 5 and 6 are connected with horizontal trusses 10 when the structure is turned to the position disclosed in Fig. 6.

Landscapes

  • General Engineering & Computer Science (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Foundations (AREA)
  • Wind Motors (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Treatment Of Liquids With Adsorbents In General (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)
  • Revetment (AREA)
EP85904679A 1984-09-19 1985-09-18 Offshore truss work type tower structure Expired EP0201513B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO843746 1984-09-19
NO843746A NO843746L (no) 1984-09-19 1984-09-19 Heksagonalt fagverks t¨rn og fremgangsm¨te ved fremstillin g av slikt.

Publications (2)

Publication Number Publication Date
EP0201513A1 EP0201513A1 (en) 1986-11-20
EP0201513B1 true EP0201513B1 (en) 1989-01-25

Family

ID=19887845

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85904679A Expired EP0201513B1 (en) 1984-09-19 1985-09-18 Offshore truss work type tower structure

Country Status (15)

Country Link
US (1) US4743141A (no)
EP (1) EP0201513B1 (no)
JP (1) JPS62500394A (no)
KR (1) KR870700267A (no)
AU (1) AU582390B2 (no)
BR (1) BR8506928A (no)
CA (1) CA1236985A (no)
DE (1) DE3567924D1 (no)
DK (1) DK154707C (no)
ES (1) ES8705068A1 (no)
FI (1) FI82966C (no)
NO (2) NO843746L (no)
OA (1) OA08865A (no)
SU (1) SU1755711A3 (no)
WO (1) WO1986001845A1 (no)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9321078D0 (en) * 1993-10-13 1993-12-01 Kvaerner Earl & Wright Offshore tower structure and method of installation
CN101351606A (zh) * 2005-05-13 2009-01-21 特雷西·利文斯顿 结构塔
EP1974111A4 (en) * 2005-12-30 2010-01-06 Tracy Livingston LIFTING SYSTEM AND APPARATUS FOR THE CONSTRUCTION OF WIND TURBINES
US8069634B2 (en) * 2006-10-02 2011-12-06 General Electric Company Lifting system and apparatus for constructing and enclosing wind turbine towers
US20080078083A1 (en) * 2006-10-02 2008-04-03 Tracy Livingston Drive pin system for a wind turbine structural tower
US20080080946A1 (en) * 2006-10-02 2008-04-03 Tracy Livingston Expansion pin system for a wind turbine structural tower
WO2009126696A1 (en) * 2008-04-08 2009-10-15 Ufo Wind Llc Wind-driven generation of power
US8016268B2 (en) * 2008-05-30 2011-09-13 Wind Tower Systems, Llc Wind tower service lift
EP2376726A4 (en) * 2008-12-15 2014-07-02 Ge Wind Energy Llc STRUCTURE FOR WINDMAST ELEMENTS
US8444347B2 (en) * 2010-08-03 2013-05-21 Technip France Truss heave plate system for offshore platform
CN103722295B (zh) * 2012-10-11 2016-02-03 烟台中集来福士海洋工程有限公司 用于钻井平台桩腿的防变形焊接方法

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2597110A (en) * 1949-08-12 1952-05-20 Lacy Robert Marine structure
US3094847A (en) * 1960-10-19 1963-06-25 Shell Oil Co Offshore platform structure
DE1708755B1 (de) * 1962-09-22 1971-12-02 Rensch Eberhard Verbindung von vorgefertigten Bauplatten zu flaechigen Bauteilen
US3412981A (en) * 1966-09-29 1968-11-26 Offshore Co Marine platform support assembly
US3563580A (en) * 1967-10-16 1971-02-16 Anthony Frederick Black Frame joint
DE1957913C3 (de) * 1969-11-12 1974-04-25 Mannesmann Leichtbau Gmbh, 8000 Muenchen Zusammensetzbare Fachwerk-Rüststütze
GB1477461A (en) * 1973-06-01 1977-06-22 King Wilkinson Ltd Off-shore structures
US4106302A (en) * 1976-05-17 1978-08-15 Maschinenfabrik Augsburg-Nurnberg Aktiengesellschaft Off-shore drilling and production platform and method of building same
US4227831A (en) * 1978-04-04 1980-10-14 Raymond International Builders, Inc. Self-contained offshore platform
GB2066336B (en) * 1979-12-27 1983-11-02 Doris Dev Richesse Sous Marine Oscitlalable marine installation and method for its construction
IT1150283B (it) * 1982-03-12 1986-12-10 Tecnomare Spa Piattaforma fissa perfezionata a struttura reticolare e a tripode per alti fondali e procedimento per la sua messa inopera
FR2530697A1 (fr) * 1982-07-22 1984-01-27 Petroles Cie Francaise Plate-forme marine oscillante

Also Published As

Publication number Publication date
NO159031B (no) 1988-08-15
NO843746L (no) 1986-03-20
JPS62500394A (ja) 1987-02-19
OA08865A (en) 1989-10-31
NO861968L (no) 1986-07-10
ES8705068A1 (es) 1987-05-01
SU1755711A3 (ru) 1992-08-15
US4743141A (en) 1988-05-10
FI82966B (fi) 1991-01-31
BR8506928A (pt) 1986-12-23
DK154707B (da) 1988-12-12
AU582390B2 (en) 1989-03-23
FI862071A0 (fi) 1986-05-19
WO1986001845A1 (en) 1986-03-27
DK228286A (da) 1986-05-16
NO159031C (no) 1988-11-23
AU4809285A (en) 1986-04-08
JPH0454761B2 (no) 1992-09-01
DK154707C (da) 1989-06-05
CA1236985A (en) 1988-05-24
EP0201513A1 (en) 1986-11-20
FI862071A (fi) 1986-05-19
FI82966C (fi) 1991-05-10
ES547097A0 (es) 1987-05-01
DE3567924D1 (en) 1989-03-02
KR870700267A (ko) 1987-08-20
DK228286D0 (da) 1986-05-16

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